05171106 is referenced by 22 patents and cites 8 patents.

A cutting/expanding tool includes a cylindrical support body having a guide side and a cutting side, a pair of guide rollers mounted in tandem along the longitudinal axis of the support body on the guide side, a cutting wheel mounted between the tandem guide rollers on the cutting side of the support body, and an expander connected rearwardly of the support body. A plurality of cutting wheels may also be provided, each of progressively increasing diameter. A scoring wheel may be mounted forwardly of the cutting wheels to prescore the surface to be cut, so as to facilitate the cutting action, and a deburrer may be mounted rearwardly of all the cutting wheels so as to smooth the cut edge. A method of using the cutting/expanding tool is also described, whereby after the tool has been propelled through a buried main to cut and to expand it, a replacement main is drawn back through the existing main. A conical or wedge shaped expander may be used.

Title
Cutting/expanding tool
Application Number
636258
Publication Number
5171106
Application Date
March 20, 1992
Publication Date
December 15, 1992
Inventor
Joseph J Marazzo
Scotch Plains
NJ, US
Gerald Rockower
Brooklyn
NY, US
Agent
Fitzpatrick Cella Harper & Scinto
Assignee
Brooklyn Union Gas
NY, US
IPC
E02D 29/10
E21B 29/06
B23D 21/06
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